Abstract

CoAP is a RESTful application protocol for constrained nodes and
networks. Through the Observe option, clients can observe changes in
the state of resources and obtain a current representation of the
last resource state. This document defines two new options for CoAP
Observe so that a CoAP client can specify timing conditions when
observing a resource on a CoAP server. As a result, the CoAP client
is only informed about resource state changes when the timing
conditions are met. This offers possibilities to extend network
intelligence, enhance scalability, and optimize the lifetime and
performance in order to address the requirements from the Constrained
Nodes and Networks.